package com.lbw.facade;

/**
 * @author lbw
 * @version 1.0
 * @date 2021/6/6 13:58
 */
public class Screen {
    private final static Screen INSTANCE = new Screen();

    private Screen() {
    }

    public static Screen getInstance() {
        return INSTANCE;
    }
    public void up() {
        System.out.println("Screen up");
    }

    public void down() {
        System.out.println("Screen down");
    }
}
